Category - 3,4-Divanillyltetrahydrofuran

3,4-Divanillyltetrahydrofuran [or Divanil] is a lignan found in a Urtica dioica [stinging nettle] and is very often used in testosterone enhancing products. 3,4-Divanillyltetrahydrofuran has promising effects in vitro but lacks clinical trials. Divanillyltetrahydrofuran does not increase testosterone production, however, it binds itself to SHBH [sex hormone binding globulin] with great affinity, hence increases avaliable free tesosterone. If it works in vivo as it does in vitro it will also increase estrogen, so estrogen blocker should be added.